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Finding the Fourth Proportional to 881.52, 1,321.20 and 515.58

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Solution

The fourth proportional to 881.52, 1,321.20 and 515.58 is: 772.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.52 : 1,321.20 = 515.58 : x
  2. Step 2: Convert to fraction form
    881.52/1,321.20 = 515.58/x
  3. Step 3: Cross multiply
    881.52x = 1,321.20 × 515.58
  4. Step 4: Simplify right side
    881.52x = 681,184.30
  5. Step 5: Solve for x
    x = 681,184.30/881.52
  6. Step 6: Final answer
    x = 772.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.